Any API to get a collection of object and it's property in a page

Just wondering whether Oracle provides any API which is able to return a collection of object in page and then I can read the object name and its attributes. If such API exists, it will make my life easier to code the logic because I don't have to hardcode the object name.

I found the solution myself:
Using a cursor of
select ITEM_NAME, LABEL from APEX_030200.APEX_APPLICATION_PAGE_ITEMS
where
workspace=[Workspace Name] and
application_id=[APP_ID] and
page_id=[PAGE ID]
order by
display_sequence;
Then I can use v("ITEM_NAME") to find out the values of each page item. With this method I don't have to hardcode all the item name in the PL/SQL code. e.g. If I want to validate a page that all items cannot be empty, I can use this way, rather then creating multiple validation rules.

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mhouri > drop type obj_emp_phone_recs_table;
Type dropped.
mhouri > drop type obj_emp_phone_rec ;
Type dropped.
mhouri > CREATE TYPE obj_emp_phone_rec AS OBJECT
2    (
3       emp_number   NUMBER,
4       emp_phone    VARCHAR2(100)
5    )
6 /
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2 /
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mhouri > create or replace procedure p1(pin_tab IN obj_emp_phone_recs_table)
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